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 TM 10-3930-638-24&P
2-32. HORN AND BACK-UP ALARM MAINTENANCE (cont)
b. Horn Switch (cont).
REMARKS
ACTION
ITEM
LOCATION
STEP
LEANING (cent)
Wear safety glasses when drying parts with compressed air.
Failure to do so could cause serious injury to eyes and possible
blindness. If you hurt your eyes or if a foreign object is blown
into your eyes, seek medical attention immediately.
Use cleaning solvent P-D-680.
Clean
Contacts (3 and 5), spring
2
Dry thoroughly with compressed air
(4) and screws (6)
Wipe with a clean, dry cloth
Clean
Cover (1), button (2) and
3
base plate (7)
Use cleaning solvent P-D-680 on termina
Clean
Connector (8) and
4
and connector only
terminal (11)
INSPECTION
Replace if coils bent or broken
Inspect
Spring (4)
5
Replace if cracked, corroded or damaged
Inspect
Contacts (3 and 5)
6
Replace if cracked, worn or damaged
Inspect
Cover (1), horn button
7
(2) and base plate (7)
Replace if worn or deteriorated
Inspect
Grommet (9)
8
TESTING
Set ohmmeter to lowest resistance range
Test
Horn wire in steering
9
and connect leads to horn wire at ferrule
column
(10) and terminal (11). Replace horn
wire if ohmmeter indicates more than
0.5 ohm (notify direct support
maintenance).
INSTALLATION/REPLACEMENT
Install
a. Grommet (9)
Steering column
10
Column terminal (11)
Push in
b. Harness connector (8)
and wheel
On steering wheel
Position
C. Base plate (7)
Until base-plate (7) is securely mounted
Install and
d. Three tapping
tighten
screws (6)
On base plate (7)
Position
e. Spring contact (5),
spring (4) and
contact cup (3)
Depress and rotate clockwise to lock
Install
f. Horn button (2) and
tabs on base plate (7); then release
cover (1)
2-178
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